Respiratory and Pneumothorax Physiology - USMLE Forums
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Old 12-13-2013
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Lungs Respiratory and Pneumothorax Physiology

Hello !

I quote from Kaplan :
" The following changes occur with development of simple pneumothorax :
- IPP increases from -5 to equal atm. pressure
- Lung recoil decreases to zero as the lung collapses
- Chest wall expands. At FRC, the chest wall is under slight tension directed outward. It is this tendency for the chest wall to spring out and the opposed force of recoil that creates the IPP of -5 cm H2O."

I don't understand the bold part ! How does that relate to pneumothorax. All i see here is normal physiology of inspiration. Can any one clear that out ?

----------

I don't understand how End tidal air doesn't reflect PaO2 in diffusion-impairment situations !??
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